Anchor pin and guide disk construction



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Nov. 5, 1968 United States Patent I V 3,408,891 I 1 ANCHOR PIN AND GUIDE DISK CONSTRUCTION Manfred Hartmann, Frastanz, Austria, assignor to Hilti Aktiengesellschaft, Schaan, Liechtenstein Filed Jan; 19, 1967, Ser. No. 610,372 priority, application Germany, Jan. 21, 1966,-

5 Claims. (51, 85-10) 4 Claims ABSTRACT on THE DrscLosuRn An anchor pin such as abolt, nail or similar element which is adapted to be driven into a hard receiving material is described herein in relation to an improved guide 'disk which is associated with the'pin for aligning the pin in a driving tool.

Two embodiments of guide disk are describ'edf'One embodiment is formed from a ring member having an interior bore of slightly larger dimension than the bore of the pin with which it is to be associated. The completed guide'disk' is formed by stamping the oversized ring memberin order to form a plurality of corrugations or wave formations which advantageously extend radially outwardly from the borewhich becomes reduced in diameterdpe .to the formation process.

, In accordance with another embodiment of the invention, the disk is made from a elliptical piece having a cut- 2 The invention relates in general to the construction of anchor pins and guide means therefor andin particular to anew and useful guide disk for an anchor pin which is made with one or more radially extending corrugations or waves which may be flattened after the pin is driven 'into a foundation in order to facilitate easy removal of the guide disk. i I I Itis known to employ guide disks in association with bolt setting machines in order to center anchor pins which are to be driven by such machines accurately within the receiving bore of such machine. Such guide disks-usually consist of steel having a diameter equal to the mouth diameter of thebolt guide of the bolt setting machine. The disks have an interior centering bore through which the shaft or shank portion of the anchor pin or bolt iscentered to permit accurate alignment of the bolt-before it-is driven into the foundation. The bolt shaft is pressed into and through the bore of the guide disk and the point of the bolt shaft is centered on the foundation into which it is to be driven. After the bolt is driven into the foundation material, the guide disk becomes fixed on the bolt shaft adjacent. the widened threaded head of the anchor bolt.

In many instances it is undesirable to leave the .guide disk on the bolt after the bolt has been driven into the "foundation; For example, in ship buliding it is considered bolt with a guide disk which canbe removed are; the driving operation is 'cornpleted. p

At the present timeit is known to employ guidedisks which are constructed ,such that they will be shattered or broken during the driving operation or may be.destroy'e d after the bolt has been driven into the foundation. It was found that this type of destructible diskis undesirable since there is a very slight risk of accidents if the bolt setting machine is ,not properly operated. For example, if the wrong size hammerpiston or' too strong a cartridge are selected, it is possible that the individual parts pfthe disk will fly off with rel'atively. great energy and injure the operator under particularly unfavorable operating conditions. It was therefore necessary, to take certain precautions when working, with such ,destruc't ible plasticdislks,

In accordance with the present inventionthere is provided a guide disk for an anchor pin which is formed from a ring member havingan oversized bore which isreduced in size to accommodate the shaft of the anchor pin by forming one or more corrugations in the wall thereof, preferably corrugations which extend radially. The guide disk is particularly applicable for use with a threadedanchor bolt which includes a shaft portion and a threaded portion of slightly larger diameter than the shaft portion so that the guide disk will become lodged between the shaft portion and the threaded portion after it is driven home. By forming the disk with the corrugations, the disk can be removed safely from the bolt after the driving operation without being broken into several pieces..ZBy forming the disk from an oversized ring member .or. a member of elliptical shape having a slot formed therein, it is possible to shorten or reduce the bore to a size at which it will snugly accommodate the shaft portion of thenchor bolt. This has the advantage that the disk aperture for the bolt can be widened by simple pressure on the corrugations of the disk after the driving operation is completed so that the disk can be safely removed by hand over the threaded portion of the bolt. The application of pressure on the corrugations of the disk can be effected upon completion of the driving operation by the hammer piston of the setting tool if the latter is so designed that it encloses the head of the bolt. The. annular end face of the hammer can be caused to strike the corrugation of the disk when the driving operation is completed so that the adjacent walls of the disk will be-pressed flat to enlarge the bore. When a setting tool which does not have a hammer piston is employed, it is preferable to employ a tool which may be positioned over the threaded head of the anchor pin and which may be positioned over the corrugations to receive a hammer blow to effect an increase ofthe guide bore of the guide disk for its removal.

A feature of the construction of the guide disk is that the provision of corrugations in the disk causes the natural stiffening of the disk so that the disk may be made of a thinner wall construction without impairing the guiding properties with regard to its strength. In this manner material can be saved which prescribes a considerable advantage for parts of this nature.

In the preferred construction a disk is formed by an oversized ring forming four separate radial corrugations at equally spaced locations around the periphery of the ring. The forming of the corrugations causes a reduction of the diameter of the bore to a size commensurate with the diameter of the pin being employed therewith. It was found that an expedient embodiment of the invention may be achieved by employing a member such as an elliptical ring-like piece with a slot formed on one side wall which extends from the bore outwardly to the periphery. The elliptical member may be easily foreshortened by forming a wave or corrugation in the opposite leg of the ellipse to also produce a shortening or elimination of the slots on theother leg in the process. disk can be removed by lateral displacement from the bolt after reenlarging the slot. Naturally the disk aperture resulting from the flattening of the corrugations depends on the thickness or height of the corrugations and a suitable height is provided as determined by the requirements for each bolt.

Accordingly, it is an object of the invention to provide .a guide disk for an anchor pin which includes an enlargeable bore with at least one radially extending corrugation formed in the disk which may be flattened for increasing the dimension of the bore. A further object of the invention is to provide an anchor bolt having a threaded portion and a shank portion which is adapted to be driven into a foundation and which is of a slightly less diameter than said threaded portion, and a guide disk positioned over said shank portion intermediate its length which has a bore of substantially the same diameter as the shank of the anchor bolt but which includes at least one corrugation formed in the wall thereof which may be flattened to increase the bore dimenjsion'to facilitate removal of the disk.

' A further object of the invention is to provide a guide disk for an anchor pin which includes a slot and in addition at least one wavey or corrugated formation extending radially outwardly from a central bore in order to facilitate enlargement of the bore and opening of the pin for removal.

A .further object of the invention is to provide a guide disk and an anchor bolt which are simple in design, rugged in construction and economical to manufacture. vThe various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of this specification. For a better understanding of the invention, its operating advantages and specific objects attained by its use, reference should be had to the accompanying drawings and descriptive matter in which there are illustrated and described preferred embodiments of the invention.

Brief description of the drawings In the drawings: FIG. 1 is a plan view of a disk blank for a guide disk constructed in accordance with the invention;

FIG. 2 is a sectional view of the disk blank of FIG. 1; I FIG. 3 is a plan view of a disk formed from the blank of FIG. 1 and constructed in accordance with the invention;

FIG. 4 is a sectional view of the disk shown in FIG. 3;

FIG. 5 is a plan view of an elliptical ring member blank for another embodiment of the invention;

FIG. 6 is a sectional view of the disk indicated in FIG. 5;

FIG. 7 is a plan view of the guide disk constructed from the blank of FIG. 5 in accordance with the invention;

FIG. 8 is an axial sectional view of the disk of FIG. 7;

FIG. 9 is a partial axial sectional view of a setting tool with an anchor bolt and guide disk constructed in accordance with the invention in a position for driving into a foundation; and

FIG. 10 is a view similar to FIG. 9 with the bolt indicated in a position secured to the foundation.

Detailed description (FIGS. 1 and 2). The blank 1 is a ring member having F an opening or bore 2 corresponding in diameter to a dimenison which is slightly larger than the threaded end or bolt head 6a of a bolt member 6 which is indicated in FIGS. 9 and 10.

In accordance with the invention, the blank 1' is formed With such a construction the by means of a suitable forming tool ,to provide corrugations 3 which in the embodiment illustrated are located at 90 intervals and extend in radial directions. The corrugations 3 extend from the opening 2 to the periphery of the guide disk 1 which is formed and in the forming operation the disk 1' is reduced in size so that the bore 2 corresponds to the diameter of a shank portion or shaft 6b of the anchor bolt 6 for retention in any position along the length thereof. The outer periphery of the disk 1 provides a centering guide in a bore 8 of a setting machine 5 indicated in FIGS. 9 and 10.

The guide disk10 indicated in FIGS. 7 and 8 is formed from an elliptical blank 10' having a leg portion with a slot 4 and an opposite leg portion 4a which is uncut. The elliptical blank 10' has a central bore-forming portion 20 of generally elliptical shape which is formed into a substantially circular shape upon the forming of a corrugation 3 in the leg portion 411 while the slot 4 is shortened to the dimension 4'. In this embodiment only onecorrugation 3 is provided.

When a guide disk 1 is to be employed, it is positioned in the bore 8 as indicated in FIG. 9. The flat side 1a of the disk is oriented downwardly in the driving direction. The setting machine 5 is provided with a hammer piston 7 which transmits the driving energy produced by a hammer blow or by the explosion of a cartridge. The bolt 7 is provided with a recess to accommodate the threaded head 6a of the anchor bolt 6. After the driving operation is completed, the anchor bolt 6 will be driven into the foundation 12 as indicated in FIG. 10. By a further hammer blow on the piston 7 or even by the driving blow, the guide disk 1, which is now situated at the juncture of the shank portion 6b and the head portion 6a, may be completely flattened, as indicated in FIG. 10. When this is done, the diameter of the bore 2 becomes removed over the head portion 6a of the anchor bolt 6.

While specific embodiments of the invention have been shown and described in detail to illustrate the application of the inventive principles, it will be understood that the invention may be embodied otherwise without departing from such principles.

What is claimed is:

1. A guide for orienting an anchor pin in the barrel of a setting tool, which anchor pin has a shank portion which is adapted to be driven into a hard foundation by the operating force of the setting tool, comprising a flat initially circular guide member having a first closed side and an opposite second open side with a slot separating said second open side into two open leg portions with ends arranged in closely spaced apart opposed relationship, a corrugation in said first closed side extending out of the plane thereof, said corrugation being adapted to 4 be flattened into the plane of said first closed side whereby to open the slot of said second open side and to separate the leg portions and to form said guide member into a substantially elliptical configuration to facilitate removal of said flat guide member from the anchor pin after it isdriven into the foundation.

2. An anchor pin device for use in association with a settingtool having a barrel for receiving the anchor pin and means for driving the anchor pin into a hard foundation, comprising an elonagted pin having a threaded head portion and an enlarged shank portion having a sharp penetrating tip which is adapted to be driven into a foundation, a flat circular guide disk having a central .bore frictionally receiving the shank portion of the pin and having at least one corrugation formed between the bore and the outer periphery of the disk, said corrugation being of sufiicient axial extent so that upon flattening of the corrugation, the bore will be enlarged to a diameter greater than that of the threaded head portion, thereby facilitating removal of the guide disk after the pin has been driven into a foundation, the outer periphery of the guide disk being of a size to facilitate centering of the anchor pin in the barrel of the setting tool.

3. An anchor bolt construction according to claim 2, wherein said guide disk has at least four separate cormgations defined therein extending from the bore outwardly to the periphery and which are equally spaced around said guide disk.

4. An anchor bolt construction according to claim 2, wherein said guide disk includes a slot extending inwardly from the periphery to the bore thereof.

5. An anchor pin device for use in association with a setting tool having a barrel for receiving the anchor pin and means for driving the anchor pin into a hard foundation, comprising a pin having a threaded head portion and a shank portion which is adapted to be driven into a foundation, a flat circular guide disk having a bore frictionally receiving the shank portion of the pin having at least one corrugation formed between the bore and the outer periphery thereof which may be flattened to enlarge the bore thereof to facilitate its removal from the pin after it is driven into the foundation, the outer periphery of the guide disk being of a size to facilitate locating and supporting of the anchor pin in the barrel of the setting tool.

References Cited UNITED STATES PATENTS 1,712,408 5/1929 Strandlund 85-86 2,025,848 12/1935 Collis 85-86 2,724,116 11/1955 Termet 8510 2,860,540 11/ 1958 Karlsson 85-8.6 2,954,534 9/1960 Neufischer 858.6 3,336,570 8/1967 Tuchel 858.6

CARL W. TOMLIN, Primary Examiner.

R. S. BRITTS, Assistant Examiner. 

